http://xyst.i2p/classtk_1_1_data.html
Use it as Data(p,c), where p is the unknown index, and c is the component index specifying the scalar equation within a system of equations. Requirement: component < nprop, unknown < nunk, enforced with an assert in DEBUG mode, see also the constructor. template<uint8_t Layout> tk:: real & tk:: Data<Layout>:: operator() ( ncomp_ t unknown, ncomp_ t component) Parameters unknown in Unknown index component in Component...